The collision velocity of the bullet cluster in conventional and modified dynamics

被引：48
作者：
Angus, G. W. [1 ]
McGaugh, S. S. [2 ]
机构：
[1] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland
[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2008年 / 383卷 / 02期
基金：
美国国家科学基金会;
关键词：
gravitation; galaxies : clusters : individual : 1E 0657-56; dark matter;
D O I：
10.1111/j.1365-2966.2007.12403.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We consider the orbit of the bullet cluster 1E 0657-56 in both cold dark matter (CDM) and Modified Newtonian Dynamics (MOND) using accurate mass models appropriate to each case in order to ascertain the maximum plausible collision velocity. Impact velocities consistent with the shock velocity (similar to 4700 km s(-1)) occur naturally in MOND. CDM can generate collision velocities of at most similar to 3800 km s(-1), and is only consistent with the data, provided that the shock velocity has been substantially enhanced by hydrodynamical effects.
引用
收藏
页码：417 / 423
页数：7
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